Download or read book Modeling and Control of a Magnetostrictive System for High Precision Actuation at a Particular Frequency written by Gang Mou and published by . This book was released on 2002 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: modeling, control, actuator, magnetostrictive.
Download or read book Modeling and Control of a Magnetostrictive System for High Precision Actuation at a Particular Frequency written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A magnetostrictive actuator made of Terfenol-D alloy can generate high mechanical strains with broadband response and provide accurate positioning. These characteristics have been employed as controllers and vibration absorbers in industrial and heavy structural applications, such as fast tool servo systems and precision micropositioners. Full utilization of magnetostrictive transducers in these applications requires a suitable controller as well as quantification of the transducer dynamics in response to various inputs. However, at moderate to high drive levels, the output from a magnetostrictive actuator is highly nonlinear and contains significant magnetic and magnetomechanical hysteresis. The control of this nonlinear system is a challenge. In order to simplify this problem, 50Hz is chosen as the working frequency for the actuator in the experiments since it shows near linear property at 50Hz and the approach used at 50Hz could be extended to a broader frequency range in the applications. First, with an optical sensor, the dynamics of the actuator are measured under voltage inputs at different frequencies and amplitudes. Using SAS System V8, a second order dynamic model is obtained at one frequency (50Hz). This model matches the open loop behavior very well. A PID controller is then developed. The control command signal generated through the DSP board is directed to the actuator. A close loop control system is thus formed. As a nonlinear control approach, sliding mode control can offer some ideal properties, such as insensitivity to parameter variations or uncertainties, external disturbance rejection, and fast dynamic response. In order to obtain better tracking performance and robustness, a sliding mode control algorithm is introduced into the system. The experiment results from the sliding mode controller are compared with those from the open loop and PID control. The comparison shows improvement in the displacement tracking performance at this frequency. Fur.
Download or read book Modeling and Control of Magnetostrictive actuated Dynamic Systems written by Zhi Li and published by . This book was released on 2015 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetostrictive actuators featuring high energy densities, large strokes and fast responses appear poised to play an increasingly important role in the field of nano/micro positioning applications. However, the performance of the actuator, in terms of precision, is mainly limited by 1) inherent hysteretic behaviors resulting from the irreversible rotation of magnetic domains within the magnetostrictive material; and 2) dynamic responses caused by the inertia and flexibility of the magnetostrictive actuator and the applied external mechanical loads. Due to the presence of the above limitations, it will prevent the magnetostrictive actuator from providing the desired performance and cause the system inaccuracy. This dissertation aims to develop a modeling and control methodology to improve the control performance of the magnetostrictive-actuated dynamic systems. Through thorough experimental investigations, a dynamic model based on the physical principle of the magnetostrictive actuator is proposed, in which the nonlinear hysteresis effect and the dynamic behaviors can both be represented. Furthermore, the hysteresis effect of the magnetostrictive actuator presents asymmetric characteristics. To capture these characteristics, an asymmetric shifted Prandtl-Ishlinskii (ASPI) model is proposed, being composed by three components: a Prandtl-Ishlinskii (PI) operator, a shift operator and an auxiliary function. The advantages of the proposed model are: 1) it is able to represent the asymmetric hysteresis behavior; 2) it facilitates the construction of the analytical inverse; 3) the analytical expression of the inverse compensation error can also be derived. The validity of the proposed ASPI model and the entire dynamic model was demonstrated through experimental tests on the magnetostrictive-actuated dynamic system. According to the proposed hysteresis model, the inverse compensation approach is applied for the purpose of mitigating the hysteresis effect. However, in real systems, there always exists a modeling error between the hysteresis model and the true hysteresis. The use of an estimated hysteresis model in deriving the inverse compensator will yield some degree of hysteresis compensation error. This error will cause tracking error in the closed-loop control system. To accommodate such a compensation error, an analytical expression of the inverse compensation error is derived first. Then, a prescribed adaptive control method is developed to suppress the compensation error and simultaneously guaranteeing global stability of the closed loop system with a prescribed transient and steady-state performance of the tracking error. The effectiveness of the proposed control scheme is validated on the magnetostrictive-actuated experimental platform. The experimental results illustrate an excellent tracking performance by using the developed control scheme.
Download or read book A Multi coil Magnetostrictive Actuator Design Analysis and Experiment written by Thomas Lawler Wilson and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation investigates a new design for a magnetostrictive actuator that employs individually controlled coils distributed axially along the magnetostrictive rod. As a quantitative goal, the objective is to show that the multi-coil actuator can operate effectively at frequencies as high as 10,000 Hz with 900 N force and 50 microns of displacement. Conventional, single coil actuators with the same parameters for force and displacement develop significant attenuation in their response at frequencies above the first longitudinal vibration resonance at about 2750 Hz. The goal of the research is to investigate whether multiple coils can effectively increase the frequency range a least four times the range of conventional magnetostrictive actuators. This document derives a new mathematical model of the actuator that represents the spatial distributions of magnetic field and vibration, devises a control design that takes advantage of the multiple inputs to control the displacement of the actuator while consuming minimum electrical power, and describes a prototype multi-coil actuator and experimental system developed to test the idea. The simulations of the multi-coil actuator and control design demonstrate successful transient operation of the actuator over the targeted frequency range with feasible levels of input power and current. Experimental tests of the design, although limited by a computer sampling rate less than 10,000 Hz, are able to validate the predictions of the developed model of the actuator and reproduce the simulated control performance within the constraints of the experimental system.
Download or read book Modeling and Control of Vibration in Mechanical Systems written by Chunling Du and published by CRC Press. This book was released on 2018-09-03 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the ox carts and pottery wheels the spacecrafts and disk drives, efficiency and quality has always been dependent on the engineer’s ability to anticipate and control the effects of vibration. And while progress in negating the noise, wear, and inefficiency caused by vibration has been made, more is needed. Modeling and Control of Vibration in Mechanical Systems answers the essential needs of practitioners in systems and control with the most comprehensive resource available on the subject. Written as a reference for those working in high precision systems, this uniquely accessible volume: Differentiates between kinds of vibration and their various characteristics and effects Offers a close-up look at mechanical actuation systems that are achieving remarkably high precision positioning performance Includes techniques for rejecting vibrations of different frequency ranges Covers the theoretical developments and principles of control design with detail elaborate enough that readers will be able to apply the techniques with the help of MATLAB® Details a wealth of practical working examples as well as a number of simulation and experimental results with comprehensive evaluations The modern world’s ever-growing spectra of sophisticated engineering systems such as hard disk drives, aeronautic systems, and manufacturing systems have little tolerance for unanticipated vibration of even the slightest magnitude. Accordingly, vibration control continues to draw intensive focus from top control engineers and modelers. This resource demonstrates the remarkable results of that focus to date, and most importantly gives today’s researchers the technology that they need to build upon into the future. Chunling Du is currently researching modeling and advanced servo control of hard disk drives at the Data Storage Institute in Singapore. Lihua Xie is the Director of the Centre for Intelligent Machines and a professor at Nanyang Technological University in Singapore.
Download or read book Modeling and Compensation of Rate Dependent Asymmetric Hysteresis Nonlinearities of Magnetostrictive Actuators written by Omar Aljanaideh and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the International Conference on Smart Materials Structures and Systems written by and published by Allied Publishers. This book was released on 1999 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multi Stage Actuation Systems and Control written by Chunling Du and published by CRC Press. This book was released on 2018-11-01 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book aims at empowering readers with a clear understanding of multi-stage mechanism, different microactuators’ performances, their limitations to control system performance and problems encountered in control system design and techniques for solving these problems and dealing with these limitations. This book is designed for academic researchers and engineering practitioners in systems and control, especially those engaged in the area of control in mechanical systems with microactuators and multi-stage actuations. Provides specific applications of multi-stage mechanical actuation systems Discusses issues and solutions in control system design for multi-stage mechanical actuation systems Discusses various types of microactuators and their control methods in multi-stage mechanism Includes real-world examples for demonstrating underlying concepts and design techniques Explores what a multi-stage mechanical systems is, for what purpose the multi-stage system is applied, how it works and how to control it for high performance
Download or read book A Nonlinear Physics Based Optimal Control Method for Magnetostrictive Actuators written by Ralph C. Smith and published by . This book was released on 1998 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Nonlinear Physics based Optimal Control Method for Magnetostrictive Actuators written by Ralph C. Smith and published by . This book was released on 1998 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nano Positioning Control Using Magnetostrictive Actuators written by Sina Valadkhan and published by LAP Lambert Academic Publishing. This book was released on 2009-10 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, a growing demand for micropositioning actuators is seen in industry. Smart materials such as piezoceramics and magnetostrictive materials are often utilized in these actuators. These materials exhibit some degree of nonlinearity and hysteresis that makes them difficult to control. An accurate hysteresis model and closed-loop feedback system is needed to satisfy the application requirements. This book addresses the recent advances in modeling and control of hysteretic systems. Different hysteresis models for magnetostrictive materials are studied. While this book includes some advanced controllers for hysteretic systems, it is mainly focused on PID control. Most existing smart actuator controllers utilize PID controllers. Performance and limits of these controllers are studied in detail for the applications. The results presented in this book are demonstrated using experiments performed on a magnetostrictive actuator. These results are useful to researchers who work on hysteretic systems, as well as engineers who use closed loop control on hysteretic systems. This work has won Outstanding Achievement in Graduate Studies Award in the University of Waterloo.
Download or read book Design Modeling and Experiments of 3 DOF Electromagnetic Spherical Actuators written by Liang Yan and published by Springer Science & Business Media. This book was released on 2011-06-06 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: A spherical actuator is a novel electric device that can achieve 2/3-DOF rotational motions in a single joint with electric power input. It has advantages such as compact structure, low mass/moment of inertia, fast response and non-singularities within the workspace. It has promising applications in robotics, automobile, manufacturing, medicine and aerospace industry. This is the first monograph that introduces the research on spherical actuators systematically. It broadens the scope of actuators from conventional single-axis to multi-axis, which will help both beginners and researchers to enhance their knowledge on electromagnetic actuators. Generic analytic modeling methods for magnetic field and torque output are developed, which can be applied to the development of other electromagnetic actuators. A parametric design methodology that allows fast analysis and design of spherical actuators for various applications is proposed. A novel non-contact high-precision 3-DOF spherical motion sensing methodology is developed and evaluated with experiments, which shows that it can achieve one order of magnitude higher precision than conventional methods. The technologies of nondimensionalization and normalization are introduced into magnetic field analysis the first time, and a benchmark database is established for the reference of other researches on spherical actuators.
Download or read book Modeling and Control of Magnetostrictive Actuators written by Wei Zhang and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling and Adaptive Control of Magnetostrictive Actuators written by and published by . This book was released on 1999 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, we propose a model and formulate a control methodology for a thin magnetostrictive rod actuator. The goal is to obtain a bulk, low dimensional model that can be used for real-time control purposes. Previous and concurrent research in the modeling of magnetostrictive actuators and the related area of electrostrictive actuators have produced models that are of low order and reproduce their quasi-static response reasonably well. But the main interest in using these and other smart actuators is at a high frequency - for producing large displacements with mechanical rectification, producing sonar signals etc. The well known limitation of smart actuators that are based on electro-magnetothermo-elastic behaviors of smart materials is the complex, input-rate dependent, hysteretic behavior of the latter.
Download or read book Geo Informatics in Resource Management and Sustainable Ecosystem written by Fuling Bian and published by Springer. This book was released on 2016-01-12 with total page 999 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume constitutes the refereed proceedings of the Third International Conference on Geo-Informatics in Resource Management and Sustainable Ecosystem, GRMSE 2015, held in Wuhan, China, in October 2015. The 101 papers presented were carefully reviewed and selected from 321 submissions. The papers are divided into topical sections on Smart City in Resource Management and Sustainable Ecosystem; Spatial Data Acquisition Through RS and GIS in Resource Management and Sustainable Ecosystem; Ecological and Environmental Data Processing and Management; Advanced Geospatial Model and Analysis for Understanding Ecological and Environmental Process; Applications of Geo-Informatics in Resource Management and Sustainable Ecosystem.
Download or read book Mechanics of Magnetostrictive Materials and Structures written by Farzad Ebrahimi and published by CRC Press. This book was released on 2023-11-22 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanics of Magnetostrictive Materials and Structures demonstrates the practical applications and uses for cutting-edge smart magnetostrictive materials. Exploring the analytical and numerical solution procedures and characteristics of these materials more generally, the book details how these materials respond to external factors. Exceptionally adjustable and adaptable, magnetostrictive materials are artifcial structures that offer distinctive physical properties. Providing clear illustrations throughout, this book includes a comprehensive guide to the theory and its applications. Presenting the mathematical tools needed to analyze magnetostrictive materials and structures, through the use of MATLAB®, the book will also detail static analysis. Comprehensively assessing the practicalities of these smart materials, it also discusses vibration and buckling under different loads, alongside dynamic behavior. Features: Includes MATLAB® for analytical and numerical simulations relevant to mechanics of magnetostrictive materials Presents vibration analysis of magnetostrictive materials and structures Demonstrates and analyzes the effect of implementing boundary conditions on the mechanical responses of magnetostrictive structures Examines the use of smart materials in engineering structures Aimed at students and professionals working in the field of mechanics, materials and dynamics, the book is an essential guide to this rapidly developing area.
